Overhanging Electronic Component Islands on Flexible Substrates
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Solution Overview
Problem
The integration of rigid electronic components into flexible electronic devices is limited by their inability to withstand mechanical deformation, causing strain and impeding the flexibility of the substrate when fully coupled.
Innovation Solution
A flexible substrate with overhanging electronic component islands, where each island is mechanically coupled via a single connection-support pad, allowing the substrate to strain independently and reducing the impact of strain on the islands, which are positioned to overhang and be free from the substrate, thereby maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic component islands are fully mechanically coupled to the flexible substrate, then structural stability and electrical connection are improved, but the flexibility and strain capability of the substrate deteriorates
Solution Approach 1:
The electronic component island is divided into two distinct portions: a connection portion that is mechanically coupled to the flexible substrate and an overhang portion that is substantially free of the substrate. This segmentation allows the connection portion to provide structural stability and electrical connection while the overhang portion maintains flexibility and can move independently during substrate deformation.
Solution Approach 2:
The connection portion acts as an intermediary element between the rigid electronic components and the flexible substrate. It provides the necessary mechanical coupling and electrical connection while isolating the overhang portion from substrate strain, thereby mediating between the conflicting requirements of structural stability and flexibility.
2Adaptability or versatility
If a larger surface area is covered with rigid electronic components, then device functionality is improved, but the ability of the substrate to withstand mechanical deformation deteriorates
Solution Approach 1:
By segmenting the electronic component island into connection and overhang portions, the invention allows larger areas to be covered with rigid electronics without compromising substrate strain capability. The overhang portion can move freely during deformation, preventing stress concentration and damage to the rigid components.
3Reliability
If the entire surface of the electronic component island is mechanically coupled to the substrate, then electrical connection reliability is improved, but the flexing and stretching of the substrate is impeded
Solution Approach 1:
The mechanical coupling is segmented to occur only at the connection portion, while the overhang portion remains uncoupled. This allows electrical connection reliability to be maintained through the connection portion while the overhang portion enables free substrate flexing and stretching without impediment.
Data Source
AI summary
An apparatus including a flexible substrate; and an overhanging electronic component island, the electronic component island configured to be less flexible than the flexible substrate and including one or more electronic components, wherein the electronic component island includes a substrate-face with a connection portion and an overhang portion, the connection portion being mechanically coupled to a surface of the flexible substrate via a single connection-support pad and the overhang portion configured to overhang and be substantially free of the underlying flexible substrate such that the underlying flexible substrate can be strained independently from the overhang portion under operational strains of the flexible substrate.